drivers: Introduce a simplified remoteproc framework

Many System on Chip(SoC) solutions are complex with multiple processors
on the same die dedicated to either general purpose of specialized
functions. Many examples do exist in today's SoCs from various vendors.
Typical examples are micro controllers such as an ARM M3/M0 doing a
offload of specific function such as event integration or power
management or controlling camera etc.

Traditionally, the responsibility of loading up such a processor with a
firmware and communication has been with a High Level Operating
System(HLOS) such as Linux. However, there exists classes of products
where Linux would need to expect services from such a processor or the
delay of Linux and operating system being able to load up such a
firmware is unacceptable.

To address these needs, we need some minimal capability to load such a
system and ensure it is started prior to an Operating System(Linux or
any other) is started up.

NOTE: This is NOT meant to be a solve-all solution, instead, it tries to
address certain class of SoCs and products that need such a solution.

A very simple model is introduced here as part of the initial support
that supports microcontrollers with internal memory (no MMU, no
execution from external memory, or specific image format needs). This
basic framework can then (hopefully) be extensible to other complex SoC
processor support as need be.

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Nishanth Menon <nm@ti.com>
Acked-by: Simon Glass <sjg@chromium.org>

12 files changed, 1074 insertions, 0 deletions

diff --git a/common/Kconfig b/common/Kconfig
index 0d44993800d..0388a6c34d4 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -350,6 +350,11 @@ config CMD_FPGA
 	help
 	  FPGA support.
 
+config CMD_REMOTEPROC
+	bool "remoteproc"
+	depends on REMOTEPROC
+	help
+	  Support for Remote Processor control
 endmenu
 
 
diff --git a/common/Makefile b/common/Makefile
index 491c56552f4..8c7775a783a 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -154,6 +154,7 @@ obj-$(CONFIG_CMD_PXE) += cmd_pxe.o
 obj-$(CONFIG_CMD_READ) += cmd_read.o
 obj-$(CONFIG_CMD_REGINFO) += cmd_reginfo.o
 obj-$(CONFIG_CMD_REISER) += cmd_reiser.o
+obj-$(CONFIG_CMD_REMOTEPROC) += cmd_remoteproc.o
 obj-$(CONFIG_SANDBOX) += cmd_host.o
 obj-$(CONFIG_CMD_SATA) += cmd_sata.o
 obj-$(CONFIG_CMD_SF) += cmd_sf.o
diff --git a/common/cmd_remoteproc.c b/common/cmd_remoteproc.c
new file mode 100644
index 00000000000..794a406b782
--- /dev/null
+++ b/common/cmd_remoteproc.c
@@ -0,0 +1,281 @@
+/*
+ * (C) Copyright 2015
+ * Texas Instruments Incorporated - http://www.ti.com/
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+#include <common.h>
+#include <command.h>
+#include <dm.h>
+#include <errno.h>
+#include <malloc.h>
+#include <remoteproc.h>
+
+/**
+ * print_remoteproc_list() - print all the remote processor devices
+ *
+ * Return: 0 if no error, else returns appropriate error value.
+ */
+static int print_remoteproc_list(void)
+{
+	struct udevice *dev;
+	struct uclass *uc;
+	int ret;
+	char *type;
+
+	ret = uclass_get(UCLASS_REMOTEPROC, &uc);
+	if (ret) {
+		printf("Cannot find Remote processor class\n");
+		return ret;
+	}
+
+	uclass_foreach_dev(dev, uc) {
+		struct dm_rproc_uclass_pdata *uc_pdata;
+		const struct dm_rproc_ops *ops = rproc_get_ops(dev);
+
+		uc_pdata = dev_get_uclass_platdata(dev);
+
+		switch (uc_pdata->mem_type) {
+		case RPROC_INTERNAL_MEMORY_MAPPED:
+			type = "internal memory mapped";
+			break;
+		default:
+			type = "unknown";
+			break;
+		}
+		printf("%d - Name:'%s' type:'%s' supports: %s%s%s%s%s%s\n",
+		       dev->seq,
+		       uc_pdata->name,
+		       type,
+		       ops->load ? "load " : "",
+		       ops->start ? "start " : "",
+		       ops->stop ? "stop " : "",
+		       ops->reset ? "reset " : "",
+		       ops->is_running ? "is_running " : "",
+		       ops->ping ? "ping " : "");
+	}
+	return 0;
+}
+
+/**
+ * do_rproc_init() - do basic initialization
+ * @cmdtp:	unused
+ * @flag:	unused
+ * @argc:	unused
+ * @argv:	unused
+ *
+ * Return: 0 if no error, else returns appropriate error value.
+ */
+static int do_rproc_init(cmd_tbl_t *cmdtp, int flag, int argc,
+			 char *const argv[])
+{
+	if (rproc_is_initialized()) {
+		printf("\tRemote Processors are already initialized\n");
+	} else {
+		if (!rproc_init())
+			return 0;
+		printf("Few Remote Processors failed to be initalized\n");
+	}
+
+	return CMD_RET_FAILURE;
+}
+
+/**
+ * do_remoteproc_list() - print list of remote proc devices.
+ * @cmdtp:	unused
+ * @flag:	unused
+ * @argc:	unused
+ * @argv:	unused
+ *
+ * Return: 0 if no error, else returns appropriate error value.
+ */
+static int do_remoteproc_list(cmd_tbl_t *cmdtp, int flag, int argc,
+			      char *const argv[])
+{
+	if (!rproc_is_initialized()) {
+		printf("\t Remote Processors is not initialized\n");
+		return CMD_RET_USAGE;
+	}
+
+	if (print_remoteproc_list())
+		return CMD_RET_FAILURE;
+
+	return 0;
+}
+
+/**
+ * do_remoteproc_load() - Load a remote processor with binary image
+ * @cmdtp:	unused
+ * @flag:	unused
+ * @argc:	argument count for the load function
+ * @argv:	arguments for the load function
+ *
+ * Return: 0 if no error, else returns appropriate error value.
+ */
+static int do_remoteproc_load(cmd_tbl_t *cmdtp, int flag, int argc,
+			      char *const argv[])
+{
+	ulong addr, size;
+	int id, ret;
+
+	if (argc != 4)
+		return CMD_RET_USAGE;
+
+	id = (int)simple_strtoul(argv[1], NULL, 3);
+	addr = simple_strtoul(argv[2], NULL, 16);
+
+	size = simple_strtoul(argv[3], NULL, 16);
+
+	if (!size) {
+		printf("\t Expect some size??\n");
+		return CMD_RET_USAGE;
+	}
+
+	if (!rproc_is_initialized()) {
+		printf("\tRemote Processors are not initialized\n");
+		return CMD_RET_USAGE;
+	}
+
+	ret = rproc_load(id, addr, size);
+	printf("Load Remote Processor %d with data@addr=0x%08lx %lu bytes:%s\n",
+	       id, addr, size, ret ? " Failed!" : " Success!");
+
+	return ret ? CMD_RET_FAILURE : 0;
+}
+
+/**
+ * do_remoteproc_wrapper() - wrapper for various  rproc commands
+ * @cmdtp:	unused
+ * @flag:	unused
+ * @argc:	argument count for the rproc command
+ * @argv:	arguments for the rproc command
+ *
+ * Most of the commands just take id as a parameter andinvoke various
+ * helper routines in remote processor core. by using a set of
+ * common checks, we can reduce the amount of code used for this.
+ *
+ * Return: 0 if no error, else returns appropriate error value.
+ */
+static int do_remoteproc_wrapper(cmd_tbl_t *cmdtp, int flag, int argc,
+				 char *const argv[])
+{
+	int id, ret = CMD_RET_USAGE;
+
+	if (argc != 2)
+		return CMD_RET_USAGE;
+
+	id = (int)simple_strtoul(argv[1], NULL, 3);
+
+	if (!rproc_is_initialized()) {
+		printf("\tRemote Processors are not initialized\n");
+		return CMD_RET_USAGE;
+	}
+
+	if (!strcmp(argv[0], "start")) {
+		ret = rproc_start(id);
+	} else if (!strcmp(argv[0], "stop")) {
+		ret = rproc_stop(id);
+	} else if (!strcmp(argv[0], "reset")) {
+		ret = rproc_reset(id);
+	} else if (!strcmp(argv[0], "is_running")) {
+		ret = rproc_is_running(id);
+		if (!ret) {
+			printf("Remote processor is Running\n");
+		} else if (ret == 1) {
+			printf("Remote processor is NOT Running\n");
+			ret = 0;
+		}
+		/* Else error.. */
+	} else if (!strcmp(argv[0], "ping")) {
+		ret = rproc_ping(id);
+		if (!ret) {
+			printf("Remote processor responds 'Pong'\n");
+		} else if (ret == 1) {
+			printf("No response from Remote processor\n");
+			ret = 0;
+		}
+		/* Else error.. */
+	}
+
+	if (ret < 0)
+		printf("Operation Failed with error (%d)\n", ret);
+
+	return ret ? CMD_RET_FAILURE : 0;
+}
+
+static cmd_tbl_t cmd_remoteproc_sub[] = {
+	U_BOOT_CMD_MKENT(init, 0, 1, do_rproc_init,
+			 "Enumerate and initialize all processors", ""),
+	U_BOOT_CMD_MKENT(list, 0, 1, do_remoteproc_list,
+			 "list remote processors", ""),
+	U_BOOT_CMD_MKENT(load, 5, 1, do_remoteproc_load,
+			 "Load remote processor with provided image",
+			 "<id> [addr] [size]\n"
+			 "- id: ID of the remote processor(see 'list' cmd)\n"
+			 "- addr: Address in memory of the image to loadup\n"
+			 "- size: Size of the image to loadup\n"),
+	U_BOOT_CMD_MKENT(start, 1, 1, do_remoteproc_wrapper,
+			 "Start remote processor",
+			 "id - ID of the remote processor (see 'list' cmd)\n"),
+	U_BOOT_CMD_MKENT(stop, 1, 1, do_remoteproc_wrapper,
+			 "Stop remote processor",
+			 "id - ID of the remote processor (see 'list' cmd)\n"),
+	U_BOOT_CMD_MKENT(reset, 1, 1, do_remoteproc_wrapper,
+			 "Reset remote processor",
+			 "id - ID of the remote processor (see 'list' cmd)\n"),
+	U_BOOT_CMD_MKENT(is_running, 1, 1, do_remoteproc_wrapper,
+			 "Check to see if remote processor is running\n",
+			 "id - ID of the remote processor (see 'list' cmd)\n"),
+	U_BOOT_CMD_MKENT(ping, 1, 1, do_remoteproc_wrapper,
+			 "Ping to communicate with remote processor\n",
+			 "id - ID of the remote processor (see 'list' cmd)\n"),
+};
+
+/**
+ * do_remoteproc() - (replace: short desc)
+ * @cmdtp:	unused
+ * @flag:	unused
+ * @argc:	argument count
+ * @argv:	argument list
+ *
+ * parses up the command table to invoke the correct command.
+ *
+ * Return: 0 if no error, else returns appropriate error value.
+ */
+static int do_remoteproc(cmd_tbl_t *cmdtp, int flag, int argc,
+			 char *const argv[])
+{
+	cmd_tbl_t *c = NULL;
+
+	/* Strip off leading 'rproc' command argument */
+	argc--;
+	argv++;
+
+	if (argc)
+		c = find_cmd_tbl(argv[0], cmd_remoteproc_sub,
+				 ARRAY_SIZE(cmd_remoteproc_sub));
+	if (c)
+		return c->cmd(cmdtp, flag, argc, argv);
+
+	return CMD_RET_USAGE;
+}
+
+U_BOOT_CMD(rproc, 5, 1, do_remoteproc,
+	   "Control operation of remote processors in an SoC",
+	   " [init|list|load|start|stop|reset|is_running|ping]\n"
+	   "\t\t Where:\n"
+	   "\t\t[addr] is a memory address\n"
+	   "\t\t<id> is a numerical identifier for the remote processor\n"
+	   "\t\t     provided by 'list' command.\n"
+	   "\t\tNote: Remote processors must be initalized prior to usage\n"
+	   "\t\tNote: Services are dependent on the driver capability\n"
+	   "\t\t      'list' command shows the capability of each device\n"
+	   "\n\tSubcommands:\n"
+	   "\tinit   - Enumerate and initalize the remote processors\n"
+	   "\tlist   - list available remote processors\n"
+	   "\tload <id> [addr] [size]- Load the remote processor with binary\n"
+	   "\t		  image stored at address [addr] in memory\n"
+	   "\tstart <id>	- Start the remote processor(must be loaded)\n"
+	   "\tstop <id>	- Stop the remote processor\n"
+	   "\treset <id>	- Reset the remote processor\n"
+	   "\tis_running <id> - Reports if the remote processor is running\n"
+	   "\tping <id>	- Ping the remote processor for communication\n");
diff --git a/doc/device-tree-bindings/remoteproc/remoteproc.txt b/doc/device-tree-bindings/remoteproc/remoteproc.txt
new file mode 100644
index 00000000000..031764f515a
--- /dev/null
+++ b/doc/device-tree-bindings/remoteproc/remoteproc.txt
@@ -0,0 +1,14 @@
+Remote Processor uclass
+
+Binding:
+
+Remoteproc devices shall have compatible corresponding to thier
+drivers. However the following generic properties will be supported
+
+Optional Properties:
+- remoteproc-name: a string, used if provided to describe the processor.
+  This must be unique in an operational system.
+- remoteproc-internal-memory-mapped: a bool, indicates that the remote
+  processor has internal memory that it uses to execute code and store
+  data. Such a device is not expected to have a MMU. If no type property
+  is provided, the device is assumed to map to such a model.
diff --git a/doc/driver-model/remoteproc-framework.txt b/doc/driver-model/remoteproc-framework.txt
new file mode 100644
index 00000000000..094e98bba64
--- /dev/null
+++ b/doc/driver-model/remoteproc-framework.txt
@@ -0,0 +1,168 @@
+#
+# (C) Copyright 2015
+# Texas Instruments Incorporated - http://www.ti.com/
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+Remote Processor Framework
+==========================
+TOC:
+1. Introduction
+2. How does it work - The driver
+3. Describing the device using platform data
+4. Describing the device using device tree
+
+1. Introduction
+===============
+
+This is an introduction to driver-model for Remote Processors found
+on various System on Chip(SoCs). The term remote processor is used to
+indicate that this is not the processor on which U-Boot is operating
+on, instead is yet another processing entity that may be controlled by
+the processor on which we are functional.
+
+The simplified model depends on a single UCLASS - UCLASS_REMOTEPROC
+
+UCLASS_REMOTEPROC:
+- drivers/remoteproc/rproc-uclass.c
+- include/remoteproc.h
+
+Commands:
+- common/cmd_remoteproc.c
+
+Configuration:
+CONFIG_REMOTEPROC is selected by drivers as needed
+CONFIG_CMD_REMOTEPROC for the commands if required.
+
+2. How does it work - The driver
+=================================
+
+Overall, the driver statemachine transitions are typically as follows:
+        (entry)
+        +-------+
+    +---+ init  |
+    |   |       | <---------------------+
+    |   +-------+                       |
+    |                                   |
+    |                                   |
+    |   +--------+                      |
+Load|   |  reset |                      |
+    |   |        | <----------+         |
+    |   +--------+            |         |
+    |        |Load            |         |
+    |        |                |         |
+    |   +----v----+   reset   |         |
+    +-> |         |    (opt)  |         |
+        |  Loaded +-----------+         |
+        |         |                     |
+        +----+----+                     |
+             | Start                    |
+         +---v-----+        (opt)       |
+      +->| Running |        Stop        |
+Ping  +- |         +--------------------+
+(opt)    +---------+
+
+(is_running does not change state)
+opt: Optional state transition implemented by driver.
+
+NOTE: It depends on the remote processor as to the exact behavior
+of the statemachine, remoteproc core does not intent to implement
+statemachine logic. Certain processors may allow start/stop without
+reloading the image in the middle, certain other processors may only
+allow us to start the processor(image from a EEPROM/OTP) etc.
+
+It is hence the responsibility of the driver to handle the requisite
+state transitions of the device as necessary.
+
+Basic design assumptions:
+
+Remote processor can operate on a certain firmware that maybe loaded
+and released from reset.
+
+The driver follows a standard UCLASS DM.
+
+in the bare minimum form:
+
+static const struct dm_rproc_ops sandbox_testproc_ops = {
+	.load = sandbox_testproc_load,
+	.start = sandbox_testproc_start,
+};
+
+static const struct udevice_id sandbox_ids[] = {
+	{.compatible = "sandbox,test-processor"},
+	{}
+};
+
+U_BOOT_DRIVER(sandbox_testproc) = {
+	.name = "sandbox_test_proc",
+	.of_match = sandbox_ids,
+	.id = UCLASS_REMOTEPROC,
+	.ops = &sandbox_testproc_ops,
+	.probe = sandbox_testproc_probe,
+};
+
+This allows for the device to be probed as part of the "init" command
+or invocation of 'rproc_init()' function as the system dependencies define.
+
+The driver is expected to maintain it's own statemachine which is
+appropriate for the device it maintains. It must, at the very least
+provide a load and start function. We assume here that the device
+needs to be loaded and started, else, there is no real purpose of
+using the remoteproc framework.
+
+3. Describing the device using platform data
+============================================
+
+*IMPORTANT* NOTE: THIS SUPPORT IS NOT MEANT FOR USE WITH NEWER PLATFORM
+SUPPORT. THIS IS ONLY FOR LEGACY DEVICES. THIS MODE OF INITIALIZATION
+*WILL* BE EVENTUALLY REMOVED ONCE ALL NECESSARY PLATFORMS HAVE MOVED
+TO DM/FDT.
+
+Considering that many platforms are yet to move to device-tree model,
+a simplified definition of a device is as follows:
+
+struct dm_rproc_uclass_pdata proc_3_test = {
+	.name = "proc_3_legacy",
+	.mem_type = RPROC_INTERNAL_MEMORY_MAPPED,
+	.driver_plat_data = &mydriver_data;
+};
+
+U_BOOT_DEVICE(proc_3_demo) = {
+	.name = "sandbox_test_proc",
+	.platdata = &proc_3_test,
+};
+
+There can be additional data that may be desired depending on the
+remoteproc driver specific needs (for example: SoC integration
+details such as clock handle or something similar). See appropriate
+documentation for specific remoteproc driver for further details.
+These are passed via driver_plat_data.
+
+3. Describing the device using device tree
+==========================================
+/ {
+	...
+	aliases {
+		...
+		remoteproc0 = &rproc_1;
+		remoteproc1 = &rproc_2;
+
+	};
+	...
+
+	rproc_1: rproc@1 {
+		compatible = "sandbox,test-processor";
+		remoteproc-name = "remoteproc-test-dev1";
+	};
+
+	rproc_2: rproc@2 {
+		compatible = "sandbox,test-processor";
+		internal-memory-mapped;
+		remoteproc-name = "remoteproc-test-dev2";
+	};
+	...
+};
+
+aliases usage is optional, but it is usually recommended to ensure the
+users have a consistent usage model for a platform.
+the compatible string used here is specific to the remoteproc driver involved.
diff --git a/drivers/Kconfig b/drivers/Kconfig
index 63c92c594a7..c02f3231e07 100644
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -46,6 +46,8 @@ source "drivers/power/Kconfig"
 
 source "drivers/ram/Kconfig"
 
+source "drivers/remoteproc/Kconfig"
+
 source "drivers/rtc/Kconfig"
 
 source "drivers/serial/Kconfig"
diff --git a/drivers/Makefile b/drivers/Makefile
index 9d0a5959a8e..1a30ad1d147 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -59,6 +59,7 @@ obj-y += pwm/
 obj-y += input/
 # SOC specific infrastructure drivers.
 obj-y += soc/
+obj-$(CONFIG_REMOTEPROC) += remoteproc/
 obj-y += thermal/
 
 endif
diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
new file mode 100644
index 00000000000..444682624ac
--- /dev/null
+++ b/drivers/remoteproc/Kconfig
@@ -0,0 +1,15 @@
+#
+# (C) Copyright 2015
+# Texas Instruments Incorporated - http://www.ti.com/
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+menu "Remote Processor drivers"
+
+# REMOTEPROC gets selected by drivers as needed
+# All users should depend on DM
+config REMOTEPROC
+	bool
+	depends on DM
+
+endmenu
diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
new file mode 100644
index 00000000000..14c27929b63
--- /dev/null
+++ b/drivers/remoteproc/Makefile
@@ -0,0 +1,7 @@
+#
+# (C) Copyright 2015
+# Texas Instruments Incorporated - http://www.ti.com/
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+obj-$(CONFIG_REMOTEPROC) += rproc-uclass.o
diff --git a/drivers/remoteproc/rproc-uclass.c b/drivers/remoteproc/rproc-uclass.c
new file mode 100644
index 00000000000..a421e12e5d1
--- /dev/null
+++ b/drivers/remoteproc/rproc-uclass.c
@@ -0,0 +1,417 @@
+/*
+ * (C) Copyright 2015
+ * Texas Instruments Incorporated - http://www.ti.com/
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+#define pr_fmt(fmt) "%s: " fmt, __func__
+#include <common.h>
+#include <errno.h>
+#include <fdtdec.h>
+#include <malloc.h>
+#include <remoteproc.h>
+#include <asm/io.h>
+#include <dm/device-internal.h>
+#include <dm.h>
+#include <dm/uclass.h>
+#include <dm/uclass-internal.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/**
+ * for_each_remoteproc_device() - iterate through the list of rproc devices
+ * @fn: check function to call per match, if this function returns fail,
+ *	iteration is aborted with the resultant error value
+ * @skip_dev:	Device to skip calling the callback about.
+ * @data:	Data to pass to the callback function
+ *
+ * Return: 0 if none of the callback returned a non 0 result, else returns the
+ * result from the callback function
+ */
+static int for_each_remoteproc_device(int (*fn) (struct udevice *dev,
+					struct dm_rproc_uclass_pdata *uc_pdata,
+					const void *data),
+				      struct udevice *skip_dev,
+				      const void *data)
+{
+	struct udevice *dev;
+	struct dm_rproc_uclass_pdata *uc_pdata;
+	int ret;
+
+	for (ret = uclass_find_first_device(UCLASS_REMOTEPROC, &dev); dev;
+	     ret = uclass_find_next_device(&dev)) {
+		if (ret || dev == skip_dev)
+			continue;
+		uc_pdata = dev_get_uclass_platdata(dev);
+		ret = fn(dev, uc_pdata, data);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+/**
+ * _rproc_name_is_unique() - iteration helper to check if rproc name is unique
+ * @dev:	device that we are checking name for
+ * @uc_pdata:	uclass platform data
+ * @data:	compare data (this is the name we want to ensure is unique)
+ *
+ * Return: 0 is there is no match(is unique); if there is a match(we dont
+ * have a unique name), return -EINVAL.
+ */
+static int _rproc_name_is_unique(struct udevice *dev,
+				 struct dm_rproc_uclass_pdata *uc_pdata,
+				 const void *data)
+{
+	const char *check_name = data;
+
+	/* devices not yet populated with data - so skip them */
+	if (!uc_pdata->name && check_name)
+		return 0;
+
+	/* Return 0 to search further if we dont match */
+	if (strlen(uc_pdata->name) != strlen(check_name))
+		return 0;
+
+	if (!strcmp(uc_pdata->name, check_name))
+		return -EINVAL;
+
+	return 0;
+}
+
+/**
+ * rproc_name_is_unique() - Check if the rproc name is unique
+ * @check_dev:	Device we are attempting to ensure is unique
+ * @check_name:	Name we are trying to ensure is unique.
+ *
+ * Return: true if we have a unique name, false if name is not unique.
+ */
+static bool rproc_name_is_unique(struct udevice *check_dev,
+				 const char *check_name)
+{
+	int ret;
+
+	ret = for_each_remoteproc_device(_rproc_name_is_unique,
+					 check_dev, check_name);
+	return ret ? false : true;
+}
+
+/**
+ * rproc_pre_probe() - Pre probe accessor for the uclass
+ * @dev:	device for which we are preprobing
+ *
+ * Parses and fills up the uclass pdata for use as needed by core and
+ * remote proc drivers.
+ *
+ * Return: 0 if all wernt ok, else appropriate error value.
+ */
+static int rproc_pre_probe(struct udevice *dev)
+{
+	struct dm_rproc_uclass_pdata *uc_pdata;
+	const struct dm_rproc_ops *ops;
+
+	uc_pdata = dev_get_uclass_platdata(dev);
+
+	/* See if we need to populate via fdt */
+
+	if (!dev->platdata) {
+#if CONFIG_IS_ENABLED(OF_CONTROL)
+		int node = dev->of_offset;
+		const void *blob = gd->fdt_blob;
+		bool tmp;
+		if (!blob) {
+			debug("'%s' no dt?\n", dev->name);
+			return -EINVAL;
+		}
+		debug("'%s': using fdt\n", dev->name);
+		uc_pdata->name = fdt_getprop(blob, node,
+					     "remoteproc-name", NULL);
+
+		/* Default is internal memory mapped */
+		uc_pdata->mem_type = RPROC_INTERNAL_MEMORY_MAPPED;
+		tmp = fdtdec_get_bool(blob, node,
+				      "remoteproc-internal-memory-mapped");
+		if (tmp)
+			uc_pdata->mem_type = RPROC_INTERNAL_MEMORY_MAPPED;
+#else
+		/* Nothing much we can do about this, can we? */
+		return -EINVAL;
+#endif
+
+	} else {
+		struct dm_rproc_uclass_pdata *pdata = dev->platdata;
+
+		debug("'%s': using legacy data\n", dev->name);
+		if (pdata->name)
+			uc_pdata->name = pdata->name;
+		uc_pdata->mem_type = pdata->mem_type;
+		uc_pdata->driver_plat_data = pdata->driver_plat_data;
+	}
+
+	/* Else try using device Name */
+	if (!uc_pdata->name)
+		uc_pdata->name = dev->name;
+	if (!uc_pdata->name) {
+		debug("Unnamed device!");
+		return -EINVAL;
+	}
+
+	if (!rproc_name_is_unique(dev, uc_pdata->name)) {
+		debug("%s duplicate name '%s'\n", dev->name, uc_pdata->name);
+		return -EINVAL;
+	}
+
+	ops = rproc_get_ops(dev);
+	if (!ops) {
+		debug("%s driver has no ops?\n", dev->name);
+		return -EINVAL;
+	}
+
+	if (!ops->load || !ops->start) {
+		debug("%s driver has missing mandatory ops?\n", dev->name);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/**
+ * rproc_post_probe() - post probe accessor for the uclass
+ * @dev:	deivce we finished probing
+ *
+ * initiate init function after the probe is completed. This allows
+ * the remote processor drivers to split up the initializations between
+ * probe and init as needed.
+ *
+ * Return: if the remote proc driver has a init routine, invokes it and
+ * hands over the return value. overall, 0 if all went well, else appropriate
+ * error value.
+ */
+static int rproc_post_probe(struct udevice *dev)
+{
+	const struct dm_rproc_ops *ops;
+
+	ops = rproc_get_ops(dev);
+	if (!ops) {
+		debug("%s driver has no ops?\n", dev->name);
+		return -EINVAL;
+	}
+
+	if (ops->init)
+		return ops->init(dev);
+
+	return 0;
+}
+
+UCLASS_DRIVER(rproc) = {
+	.id = UCLASS_REMOTEPROC,
+	.name = "remoteproc",
+	.flags = DM_UC_FLAG_SEQ_ALIAS,
+	.pre_probe = rproc_pre_probe,
+	.post_probe = rproc_post_probe,
+	.per_device_platdata_auto_alloc_size =
+		sizeof(struct dm_rproc_uclass_pdata),
+};
+
+/* Remoteproc subsystem access functions */
+/**
+ * _rproc_probe_dev() - iteration helper to probe a rproc device
+ * @dev:	device to probe
+ * @uc_pdata:	uclass data allocated for the device
+ * @data:	unused
+ *
+ * Return: 0 if all ok, else appropriate error value.
+ */
+static int _rproc_probe_dev(struct udevice *dev,
+			    struct dm_rproc_uclass_pdata *uc_pdata,
+			    const void *data)
+{
+	int ret;
+
+	ret = device_probe(dev);
+
+	if (ret)
+		debug("%s: Failed to initialize - %d\n", dev->name, ret);
+	return ret;
+}
+
+/**
+ * _rproc_dev_is_probed() - check if the device has been probed
+ * @dev:	device to check
+ * @uc_pdata:	unused
+ * @data:	unused
+ *
+ * Return: -EAGAIN if not probed else return 0
+ */
+static int _rproc_dev_is_probed(struct udevice *dev,
+			    struct dm_rproc_uclass_pdata *uc_pdata,
+			    const void *data)
+{
+	if (dev->flags & DM_FLAG_ACTIVATED)
+		return 0;
+
+	return -EAGAIN;
+}
+
+bool rproc_is_initialized(void)
+{
+	int ret = for_each_remoteproc_device(_rproc_dev_is_probed, NULL, NULL);
+	return ret ? false : true;
+}
+
+int rproc_init(void)
+{
+	int ret;
+
+	if (rproc_is_initialized()) {
+		debug("Already initialized\n");
+		return -EINVAL;
+	}
+
+	ret = for_each_remoteproc_device(_rproc_probe_dev, NULL, NULL);
+	return ret;
+}
+
+int rproc_load(int id, ulong addr, ulong size)
+{
+	struct udevice *dev = NULL;
+	struct dm_rproc_uclass_pdata *uc_pdata;
+	const struct dm_rproc_ops *ops;
+	int ret;
+
+	ret = uclass_get_device_by_seq(UCLASS_REMOTEPROC, id, &dev);
+	if (ret) {
+		debug("Unknown remote processor id '%d' requested(%d)\n",
+		      id, ret);
+		return ret;
+	}
+
+	uc_pdata = dev_get_uclass_platdata(dev);
+
+	ops = rproc_get_ops(dev);
+	if (!ops) {
+		debug("%s driver has no ops?\n", dev->name);
+		return -EINVAL;
+	}
+
+	debug("Loading to '%s' from address 0x%08lX size of %lu bytes\n",
+	      uc_pdata->name, addr, size);
+	if (ops->load)
+		return ops->load(dev, addr, size);
+
+	debug("%s: data corruption?? mandatory function is missing!\n",
+	      dev->name);
+
+	return -EINVAL;
+};
+
+/*
+ * Completely internal helper enums..
+ * Keeping this isolated helps this code evolve independent of other
+ * parts..
+ */
+enum rproc_ops {
+	RPROC_START,
+	RPROC_STOP,
+	RPROC_RESET,
+	RPROC_PING,
+	RPROC_RUNNING,
+};
+
+/**
+ * _rproc_ops_wrapper() - wrapper for invoking remote proc driver callback
+ * @id:		id of the remote processor
+ * @op:		one of rproc_ops that indicate what operation to invoke
+ *
+ * Most of the checks and verification for remoteproc operations are more
+ * or less same for almost all operations. This allows us to put a wrapper
+ * and use the common checks to allow the driver to function appropriately.
+ *
+ * Return: 0 if all ok, else appropriate error value.
+ */
+static int _rproc_ops_wrapper(int id, enum rproc_ops op)
+{
+	struct udevice *dev = NULL;
+	struct dm_rproc_uclass_pdata *uc_pdata;
+	const struct dm_rproc_ops *ops;
+	int (*fn)(struct udevice *dev);
+	bool mandatory = false;
+	char *op_str;
+	int ret;
+
+	ret = uclass_get_device_by_seq(UCLASS_REMOTEPROC, id, &dev);
+	if (ret) {
+		debug("Unknown remote processor id '%d' requested(%d)\n",
+		      id, ret);
+		return ret;
+	}
+
+	uc_pdata = dev_get_uclass_platdata(dev);
+
+	ops = rproc_get_ops(dev);
+	if (!ops) {
+		debug("%s driver has no ops?\n", dev->name);
+		return -EINVAL;
+	}
+	switch (op) {
+	case RPROC_START:
+		fn = ops->start;
+		mandatory = true;
+		op_str = "Starting";
+		break;
+	case RPROC_STOP:
+		fn = ops->stop;
+		op_str = "Stopping";
+		break;
+	case RPROC_RESET:
+		fn = ops->reset;
+		op_str = "Resetting";
+		break;
+	case RPROC_RUNNING:
+		fn = ops->is_running;
+		op_str = "Checking if running:";
+		break;
+	case RPROC_PING:
+		fn = ops->ping;
+		op_str = "Pinging";
+		break;
+	default:
+		debug("what is '%d' operation??\n", op);
+		return -EINVAL;
+	}
+
+	debug("%s %s...\n", op_str, uc_pdata->name);
+	if (fn)
+		return fn(dev);
+
+	if (mandatory)
+		debug("%s: data corruption?? mandatory function is missing!\n",
+		      dev->name);
+
+	return -ENOSYS;
+}
+
+int rproc_start(int id)
+{
+	return _rproc_ops_wrapper(id, RPROC_START);
+};
+
+int rproc_stop(int id)
+{
+	return _rproc_ops_wrapper(id, RPROC_STOP);
+};
+
+int rproc_reset(int id)
+{
+	return _rproc_ops_wrapper(id, RPROC_RESET);
+};
+
+int rproc_ping(int id)
+{
+	return _rproc_ops_wrapper(id, RPROC_PING);
+};
+
+int rproc_is_running(int id)
+{
+	return _rproc_ops_wrapper(id, RPROC_RUNNING);
+};
diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h
index 1eeec749643..da414998724 100644
--- a/include/dm/uclass-id.h
+++ b/include/dm/uclass-id.h
@@ -49,6 +49,7 @@ enum uclass_id {
 	UCLASS_PMIC,		/* PMIC I/O device */
 	UCLASS_REGULATOR,	/* Regulator device */
 	UCLASS_RESET,		/* Reset device */
+	UCLASS_REMOTEPROC,	/* Remote Processor device */
 	UCLASS_RTC,		/* Real time clock device */
 	UCLASS_SERIAL,		/* Serial UART */
 	UCLASS_SPI,		/* SPI bus */
diff --git a/include/remoteproc.h b/include/remoteproc.h
new file mode 100644
index 00000000000..c6e044d3b8e
--- /dev/null
+++ b/include/remoteproc.h
@@ -0,0 +1,162 @@
+/*
+ * (C) Copyright 2015
+ * Texas Instruments Incorporated - http://www.ti.com/
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef _RPROC_H_
+#define _RPROC_H_
+
+/*
+ * Note: The platform data support is not meant for use with newer
+ * platforms. This is meant only for legacy devices. This mode of
+ * initialization *will* be eventually removed once all necessary
+ * platforms have moved to dm/fdt.
+ */
+#include <dm/platdata.h>	/* For platform data support - non dt world */
+
+/**
+ * enum rproc_mem_type - What type of memory model does the rproc use
+ * @RPROC_INTERNAL_MEMORY_MAPPED: Remote processor uses own memory and is memory
+ *	mapped to the host processor over an address range.
+ *
+ * Please note that this is an enumeration of memory model of different types
+ * of remote processors. Few of the remote processors do have own internal
+ * memories, while others use external memory for instruction and data.
+ */
+enum rproc_mem_type {
+	RPROC_INTERNAL_MEMORY_MAPPED	= 0,
+};
+
+/**
+ * struct dm_rproc_uclass_pdata - platform data for a CPU
+ * @name: Platform-specific way of naming the Remote proc
+ * @mem_type: one of 'enum rproc_mem_type'
+ * @driver_plat_data: driver specific platform data that may be needed.
+ *
+ * This can be accessed with dev_get_uclass_platdata() for any UCLASS_REMOTEPROC
+ * device.
+ *
+ */
+struct dm_rproc_uclass_pdata {
+	const char *name;
+	enum rproc_mem_type mem_type;
+	void *driver_plat_data;
+};
+
+/**
+ * struct dm_rproc_ops - Operations that are provided by remote proc driver
+ * @init:	Initialize the remoteproc device invoked after probe (optional)
+ *		Return 0 on success, -ve error on fail
+ * @load:	Load the remoteproc device using data provided(mandatory)
+ *		This takes the following additional arguments.
+ *			addr- Address of the binary image to be loaded
+ *			size- Size of the binary image to be loaded
+ *		Return 0 on success, -ve error on fail
+ * @start:	Start the remoteproc device (mandatory)
+ *		Return 0 on success, -ve error on fail
+ * @stop:	Stop the remoteproc device (optional)
+ *		Return 0 on success, -ve error on fail
+ * @reset:	Reset the remote proc device (optional)
+ *		Return 0 on success, -ve error on fail
+ * @is_running:	Check if the remote processor is running(optional)
+ *		Return 0 on success, 1 if not running, -ve on others errors
+ * @ping:	Ping the remote device for basic communication check(optional)
+ *		Return 0 on success, 1 if not responding, -ve on other errors
+ */
+struct dm_rproc_ops {
+	int (*init)(struct udevice *dev);
+	int (*load)(struct udevice *dev, ulong addr, ulong size);
+	int (*start)(struct udevice *dev);
+	int (*stop)(struct udevice *dev);
+	int (*reset)(struct udevice *dev);
+	int (*is_running)(struct udevice *dev);
+	int (*ping)(struct udevice *dev);
+};
+
+/* Accessor */
+#define rproc_get_ops(dev) ((struct dm_rproc_ops *)(dev)->driver->ops)
+
+#ifdef CONFIG_REMOTEPROC
+/**
+ * rproc_init() - Initialize all bound remote proc devices
+ *
+ * Return: 0 if all ok, else appropriate error value.
+ */
+int rproc_init(void);
+
+/**
+ * rproc_is_initialized() - check to see if remoteproc devices are initialized
+ *
+ * Return: 0 if all devices are initialized, else appropriate error value.
+ */
+bool rproc_is_initialized(void);
+
+/**
+ * rproc_load() - load binary to a remote processor
+ * @id:		id of the remote processor
+ * @addr:	address in memory where the binary image is located
+ * @size:	size of the binary image
+ *
+ * Return: 0 if all ok, else appropriate error value.
+ */
+int rproc_load(int id, ulong addr, ulong size);
+
+/**
+ * rproc_start() - Start a remote processor
+ * @id:		id of the remote processor
+ *
+ * Return: 0 if all ok, else appropriate error value.
+ */
+int rproc_start(int id);
+
+/**
+ * rproc_stop() - Stop a remote processor
+ * @id:		id of the remote processor
+ *
+ * Return: 0 if all ok, else appropriate error value.
+ */
+int rproc_stop(int id);
+
+/**
+ * rproc_reset() - reset a remote processor
+ * @id:		id of the remote processor
+ *
+ * Return: 0 if all ok, else appropriate error value.
+ */
+int rproc_reset(int id);
+
+/**
+ * rproc_ping() - ping a remote processor to check if it can communicate
+ * @id:		id of the remote processor
+ *
+ * NOTE: this might need communication path available, which is not implemented
+ * as part of remoteproc framework - hook on to appropriate bus architecture to
+ * do the same
+ *
+ * Return: 0 if all ok, else appropriate error value.
+ */
+int rproc_ping(int id);
+
+/**
+ * rproc_is_running() - check to see if remote processor is running
+ * @id:		id of the remote processor
+ *
+ * NOTE: this may not involve actual communication capability of the remote
+ * processor, but just ensures that it is out of reset and executing code.
+ *
+ * Return: 0 if all ok, else appropriate error value.
+ */
+int rproc_is_running(int id);
+#else
+static inline int rproc_init(void) { return -ENOSYS; }
+static inline bool rproc_is_initialized(void) { return false; }
+static inline int rproc_load(int id, ulong addr, ulong size) { return -ENOSYS; }
+static inline int rproc_start(int id) { return -ENOSYS; }
+static inline int rproc_stop(int id) { return -ENOSYS; }
+static inline int rproc_reset(int id) { return -ENOSYS; }
+static inline int rproc_ping(int id) { return -ENOSYS; }
+static inline int rproc_is_running(int id) { return -ENOSYS; }
+#endif
+
+#endif	/* _RPROC_H_ */